Malicious PDF — malware analysis report

Static analysis result for SHA-256 513a22abec8d10d2…

MALICIOUS

PDF

69.2 KB Created: 2021-03-17 08:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86c3a341f478a290074368686e4b1a8f SHA-1: d11cdcabea5d2212b6fa8e3a89ab95af7536534a SHA-256: 513a22abec8d10d285ac479f67cc78f5ede96e4a63f1ec21701e0c8ea2c4c496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are SEO-focused and lead to other PDF files, suggesting a link farm or redirection scheme. The primary lure appears to be 'Acrobat pdf editor online free', which is likely a pretext to drive traffic to malicious URLs. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/award?keyword=acrobat+pdf+editor+online+free
    • http://jinevul.mygamesonline.org/16315408191.pdf
    • http://viteroludobano.mypressonline.com/39598586955.pdf
    • https://cdn-cms.f-static.net/uploads/4483359/normal_6033e46184649.pdf
    • https://cdn-cms.f-static.net/uploads/4370092/normal_60484076e0898.pdf
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5fee0d13a09e4.pdf
    • http://leledup.mypressonline.com/8928633984.pdf
    • http://fakurivevid.scienceontheweb.net/career_in_commerce.pdf
    • http://faxixovojaja.sportsontheweb.net/95479923149.pdf
    • http://govuled.mywebcommunity.org/budijisojov.pdf
    • https://cdn-cms.f-static.net/uploads/4401545/normal_603335b5b8068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_6500940e5e0541e9bdfde8933d05c5fc.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_b2df21d43d084220a13f412c9e74fcd9.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_13e3fef2e4b143fab4e7879206e68de1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e63459b-723c-4f0e-88f1-e57771e06fe1/mazobopedakigovubidane.pdf
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_0b9e4a585842404d85c3fe9faf801748.pdf?index=true
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_83574213957a4772b37feec6236f08d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/377221cb-dc8c-4d91-af3d-e09135275559/songs_of_praise_top_10_christmas_carols_2020.pdf
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_83f8af90fb334300b7dd007841e97309.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f6a9ca5-11cc-4e7e-8f87-81549789febc/54658277951.pdf
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_14b447a6f786452796ea34df795bd8c5.pdf?index=true
    • http://wugujub.onlinewebshop.net/15856441667.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_9077315665c04e139eea9556459fd90e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fd.bin
662548ae71baf2a23a8d3c05a1be3e9f147a578c0ccfe87e7fa75477d2845bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 5100 bytes
font_01_sfnt_off0000e268.bin
b3bb64073061e042ae1ef1e2adcdff2f5ee35682b1f485627cac26207a37ffd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 11168 bytes

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